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8 bit pixel example with Ebiten
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| package main | |
| import ( | |
| "fmt" | |
| "image" | |
| "image/color" | |
| "image/draw" | |
| "log" | |
| "github.com/fogleman/gg" | |
| "github.com/hajimehoshi/ebiten" | |
| "github.com/hajimehoshi/ebiten/ebitenutil" | |
| ) | |
| const ( | |
| screenWidth = 128 | |
| screenHeight = 128 | |
| ) | |
| var ( | |
| drawImage *image.RGBA | |
| gc *gg.Context | |
| ) | |
| func update(screen *ebiten.Image) error { | |
| if ebiten.IsRunningSlowly() { | |
| return nil | |
| } | |
| screen.ReplacePixels(drawImage.Pix) | |
| ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %f", ebiten.CurrentFPS())) | |
| return nil | |
| } | |
| func main() { | |
| drawImage = image.NewRGBA(image.Rect(0, 0, screenWidth, screenHeight)) | |
| rect := image.Rect(0, 0, screenWidth, screenHeight) | |
| // 2 colour palette (black/red) | |
| palette := color.Palette{ | |
| color.RGBA{0, 0, 0, 0}, | |
| color.RGBA{255, 0, 0, 255}, | |
| } | |
| paletteImage := image.NewPaletted(rect, palette) | |
| gc = gg.NewContextForImage(drawImage) | |
| gc.SetRGB(0, 0, 0) | |
| gc.SetRGBA(1, 0, 0, 1) | |
| gc.SetLineWidth(1) | |
| gc.DrawLine(20, 20, 80, 60) | |
| gc.Stroke() | |
| // draw onto palette | |
| draw.Draw(paletteImage, rect, gc.Image(), rect.Bounds().Min, draw.Over) | |
| // draw back again | |
| draw.Draw(drawImage, rect, paletteImage, rect.Bounds().Min, draw.Over) | |
| scale := float64(800 / screenWidth) | |
| if err := ebiten.Run(update, screenWidth, screenHeight, scale, "EightBit (Ebiten Demo)"); err != nil { | |
| log.Fatal(err) | |
| } | |
| } |
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